Friction brake



Aug. 13, 1929'.

"J. THOMPSON FnIcTiou BRAKE Origihal Filed May 1, 1926 Patented Augi 13, 1929.

UNITED STATES PATENT OFF-ICE.

JAMES S. THOMPSON, 01 NEW YORK, IL Y., ASSIGNOR TO AMERICAN TBRAKE MATE- RIALS CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

FRICTION BRAKE.

Original application filed May 1, 1926, Serial No. 105,397. Divided and this application filed January 30, 1929. Serial No. 336,141.

This is a division of my application Se-. rial No. 105,897 filed May 1, 1$ )2(i.

The invention relates to friction brakes and while it is particularly adapted for ex- 6 panding brakes arranged to make friction contact with a drum,*which 1s a form of brake commonly employed in automotive vehicles, it can also be used in many other 1nstallations as will be apparent to those skllled 1b in the art.

The object of the invention 1s to provide a friction brake shoe which is adapted to be readily and easily installed in a friction brake assembly and securely held 1n llXCd position therein.

And a further object of the invention is to provide a friction brake shoe of novel construction having a body with recesses In its ends and extendirg through the wearing face of. the shoe to facilitate engagement and disengagement of the means by which the block is secured in operative posltlon in a brake assembly.

The fastening devices pro ect into the recesses and prevent sidewise movement of the shoe by engagement with the slde walls of the recesses.

In the accompanying drawings illustrating a selected embodiment of the- 1nven-,

tion

a brake assembly showing an arrangement in which my invention may be embodled.

Fig. 2 is a detail enlarged plan view of one of the blocks with the brakehead broken away.

Fig. 3 is a sectional view of the parts shown in Fig. 2.

CAD

Referring to the drawings 1 'is the brake The shoe 9 has'a body 10 of friction ma-v terial and a metal back 11. The body is preferably made of a suitable friction producing composition and the back is prefer- Fig. l is a sectional elevation of parts of abl in the form of a shell in which the b0 y is molded and to which the body is secured in any suitable manner. Each end of the body of the shoe is provided with a recess 12 spaced from the side edges of the shoe and extending from the metal back through the contact wearing face of the "shoe, the man of the back being folded upon itself at 13 forming double thickness in the bottom of the recess to be engaged by the devices which fasten the shoe or block to the head. These fastening devices may be in the form of lugs 14 which enter the recesses 12 and engage the parts 13 of the back at the bottom of the recesses, the lugs being detachably secured by bolts 15 to the head. The open recesses 12 form a convenient means whereby the lugs orother fastening devices may be readily and easily engaged with the shoe or block for securing it rigidly on the head.

I have shown one form of a brake shoe or block embodying my invention and inone type of brake assembly in the drawings but t is is merely to illustrate the invention and I reserve the right to embody the invention in any form Within the scope of the following claims and inany brake assembly to which it is or may be adapted.

I claim:

1. A friction brake shoe comprising a sup: porting back and .a composition body secured thereon, said body having recesses inset from its ends to expose portions of said back and said recesses extending from said exposed portions through the wearing face of the shoe.

2. A friction. brake shoe comprising a .composition body and a supporting back secured thereon, said body having a recess in each end spaced from its sides, portions of the back forming the bottom of the recesses and the recesses extending from said bottom forming back portions through the wearing face of the shoe.

3. A friction brake shoe comprising a composition body anda supporting back secured thereon, said body having recesses in its ends spaced from .its sides, portions ofthe back being of double thickness and forming the bottom of the recesses and the recesses ex.- tendin from said double thickness portions throng the wearing face of the shoe.

, JAMES S. THOMPSON. 

